Engine valve mechanism



May 22, 1928. 1,670,839

J; E. BUTZ ENGINE VALVE MECHANISM Filed obt. 18, 1923 Illll W 1.15: sslas gg r .e&w. r w w ww,

. his: A-Etnrnm Patented May 22, 1928.

UNITED STATES 1 1,670,839 PATENTOFFICE.

JOSEPH EQBUTZ, or DAYTON, onto, AssIGNoR ro seminar. noq ossse eiiaen cor.- roRAr-IoN, or DAYTON,-.0HIO, A CORPORATION or DELAWARE.

ENGINE vALv i mi cmrsm.

Application filed October 18; e; serial No. eeaa'eo;

This invention relates to internal-combustion engines which lnclude valve mechanism operatedby. means of arocker arm and'push rod.

It is among the objects of the invention to eliminate the necessity for lubricating the connection between the push rod and-rocker arm to secure effective operation.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawing, wherein a preferred form of embodiment of the present invention is clearly shown.

In the drawing:

Fig. 1 shows a side View of the valve controlling device.

Fig. 2 is a detail View of the flexible connection showing the flattened engaging sides of the convolutions thereof.

The drawing shows a fragment of an engine cylinder and, partly in section, a fragment of valve mechanism including the present invention.

As is well known the valves of the most common form of internal-combustion engine having over-head valve mechanism are operated by rocker arms, from a cam shaft in the engine crank case through the agency of push rods. In the drawing 20 designates a cylinder of such an engine which is provided with one or more over-head valves 21 maintained closed by spring 22. By means of a bracket 23 the engine cylinder supports a rocker arm shaft 24: carrying one or more rocker arms 25, one for each valve. 26 is a push rod for cooperating with the rocker arm 25.

The rocker arm 25 is provided with a projection including a head portion 31, having a screw threaded hole to receive the adjusting set screw 29. One end of the push rod 26 is screw threaded as at 28, this screw threaded portion having one end of a coil spring 27 screwed thereon while the other end of the coil spring is screwed onto the end of the set screw 29 which projects beyond the bottom surface of the head 31. This coil spring 27 is made up of a plurality of closely wound convolutions of wire and is thereby rendered unyielding in the direction of thrust. The contacting surfaces of the wire are flattened to prevent cocking of the spring when the push rod is operated to move the rocker arm for opening the valve with which it is associated.

Whenitis desired to adjust the rocker arm to vary the amount of clearance between the rocker arm and the valve stem the lock nut 30 associated with the set screw 29 is loosened, and the set screw is then rotated in either one direction or theother to either increase or decrease this clearance; \Vhen the set screw is rotated the spring element 27 and the push rod 26 will be rotated there-- with. v

The advantage in using a resilient connection between the rocker arm and the push rod such as is shown in the present application, resides in the fact that no lubrication is necessary due to the fact that there is no sliding contact between any of the elements that constitute the connection, thus avoiding any squeaksor rattles at this point.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might beadopted, all coming within the scope of the claims which follow.

What I claim is as follows:

1. An internal-combustion engine valve operating device comprising in combination, a valve; means for holding said valve normally in closed position; a rocker arm for operating the valve; an adjusting screw secured to the rocker arm; an engine operated push rod; and a link of flexible material interposed between the adjusting means and the push rod for transmitting motion from the push rod to the rocker arm, said link being rigidly connected both to the push rod and to the adjusting means and unyieldable in the direction of the thrust.

2. An internal-combustion engine valve operating device comprising in combination, a valve; means for holding said valve normally in closed position; a rocker arm for operating the valve mechanism; an adjusting screw carried by the rocker arm; an engine driven push rod and a coil spring including a plurality of convolutions tightly wound having one end of said spring rigidly secured to the end of the push rod and the other end of said spring secured to the en of the adjusting screw whereby motion is transmitted from the push rod to the rocker arm without sliding contact between the two.

3. An internal-combustion engine valve operating device comprising in combination, a valve;means for holding said valve normally in closed position; a rocker arm for operating the valve mechanism; an adjusting screw carried by the rocker arm; an engine driven push rod and a coil spring including a plurality of convolutions tightly Wound and having their contacting faces flattened to provide added resistance to cocking; the said spring being interposed between the end of the push rod and the adjusting screw and rigidly secured to both and adapted to transmit motion from the push rod to the rocker arm.

4:. An internal-combustion engine valve operating device comprising, a valve, a rocker arm having a threaded member, a push rod having, a threadedend, and a coil spring the turns of one end of Which engage the threads of the threaded end of the push rod and the turns of the other end oi Which engage the threads of the threaded member or the rocker arm.

5/An internal combustion engine valve operating device comprising, in combination, a valve, means for holding said valve normally in closed position, a rocker arm adapted to open the valve, a push rod, a connection'betvveen said rocker arm and said push rod comprising a spring having flattened coils in contact With each other to resist cooking of the spring, said spring being non-yieldable in the direction of thrust but laterally flexible.-

In testimony whereof 1 

